2... b8c6  3. f1b5  3... g8e7 This is the Cozio Variation of the Ruy Lopez, and it has appeared in other \"Games of the Day.\" Nakamura has used it a few times with Black but not often. He played a game with White against Caruana in 2024 that may have sparked his idea to play it with the other color. 4. b1c3 White has three other major moves. 4... e7g6 